Why does the Western fandom portray Prima as a Yandere?

Prima was given a yandere type personality by the Western fandom due to the fact that when people tried to illegally download vocaloids, such as Miku and Len/Rin Kagamine, they had to download Prima to get the program in English. However illegal downloads of Prima don’t have proper confirmations codes. Causing not only Prima to stop working but other Vocaloid programs as well. Basically if you couldn’t keep her you couldn’t keep any vocaloids.

It is said the Prima’s item is Wine, but because of her yandere nature it’s mostly likely you’ll see fanart of her holding weapons rather than the alcoholic beverage.[1]